Economic and technical evaluation of ground skidding in the logs exploitation system with Timber Jack and Clark Ranger

Subject Areas : JUNGLE

farshad keivanbehjo ¹ , zeynab poorgholi ²

1 - University of Mohaghegh Ardabili, Ardabil, I.R. Iran.
2 - , University of Mohaghegh Ardabili, Ardabil, I.R. Iran.

Received: 2017-06-26 Accepted : 2017-12-04 Published : 2017-11-22

Keywords: ground skidding, Timber Jack 450C, Clark Ranger 666 BDS, production rate, unit cost rate,

Abstract :

The purpose of this research is to evaluate the economic (production and cost) and technical (limitations) of current exploitation is to provide suggestions for increasing productivity and reducing forest exploitation costs. This study was carried out in parcel 237 of Chafroud, Shanderman watershed. For this purpose, the study of production and cost in the method of skidding system logs using two machines Timber Jack 450C and Clark Ranger 666 BDS was performed. The results of time studies and regression analysis indicate that each turning time of skidding with Timber Jack 450C have the greatest effect on the distance from the skidding distance, winching distance and interaction between skidding distance and skid slope, while each boat time using Clark Ranger 666 the greatest effect is from the interaction between skidding distance and loading volume, the interaction between the skidding distance and the slope of the skid trail and the slope of the winch. The study of the production rate of the two machines showed that the production rate of the Timber jack 450C and Clark Ranger 666 BDS were 22.93m³ and 19.29m³ per hour, respectively. The results of statistical comparisons of production rates and production unit costs in two machines show that there is a significant difference between the two machines (p = 0.04, p = 0.03). In addition, the results of a technical review of two machines suggest that the Timber jack 450C is more efficient than the Clark Ranger 666.

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